a) -1 < x 1/2d)x < - 1/2 ou x>1. Created by Ricardo. educaao-e-referencia-en - nivel-fundamental-e-medio-en

Se f(x)= -2x² - x + 1 então temos f(x)

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-2x² - x + 1 < 0

x' = 1

x'' = -1/2

coeficiente 'a' negativo portanto concavidade voltada para baixo, assim nota-se que para a equaçao ser menor que 0, a soluçao deve estar antes do -1/2 e depois do 1

Resposta: x < -1/2 ou x > 1

Espero ter ajudado e ganhar umas estrelas.

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